102 lines
2 KiB
C
102 lines
2 KiB
C
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/*
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* linux/arch/arm/mach-sa1100/leds-lart.c
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*
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* (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
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*
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* LART uses the LED as follows:
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* - GPIO23 is the LED, on if system is not idle
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* You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
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* time, but in that case the timer events will still dictate the
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* pace of the LED.
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*/
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#include <linux/init.h>
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#include <asm/hardware.h>
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#include <asm/leds.h>
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#include <asm/system.h>
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#include "leds.h"
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#define LED_STATE_ENABLED 1
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#define LED_STATE_CLAIMED 2
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static unsigned int led_state;
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static unsigned int hw_led_state;
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#define LED_23 GPIO_GPIO23
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#define LED_MASK (LED_23)
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void lart_leds_event(led_event_t evt)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch(evt) {
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case led_start:
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/* pin 23 is output pin */
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GPDR |= LED_23;
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hw_led_state = LED_MASK;
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led_state = LED_STATE_ENABLED;
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break;
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case led_stop:
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led_state &= ~LED_STATE_ENABLED;
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break;
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case led_claim:
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led_state |= LED_STATE_CLAIMED;
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hw_led_state = LED_MASK;
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break;
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case led_release:
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led_state &= ~LED_STATE_CLAIMED;
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hw_led_state = LED_MASK;
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break;
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#ifdef CONFIG_LEDS_TIMER
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case led_timer:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state ^= LED_23;
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break;
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#endif
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#ifdef CONFIG_LEDS_CPU
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case led_idle_start:
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/* The LART people like the LED to be off when the
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system is idle... */
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state &= ~LED_23;
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break;
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case led_idle_end:
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/* ... and on if the system is not idle */
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state |= LED_23;
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break;
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#endif
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case led_red_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~LED_23;
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break;
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case led_red_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= LED_23;
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break;
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default:
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break;
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}
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/* Now set the GPIO state, or nothing will happen at all */
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if (led_state & LED_STATE_ENABLED) {
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GPSR = hw_led_state;
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GPCR = hw_led_state ^ LED_MASK;
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}
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local_irq_restore(flags);
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}
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